(1) A person commits the offense of use of marijuana while driving if the person uses any marijuana while driving a motor vehicle upon a highway.

(2) The offense described in this section, use of marijuana while driving, is a Class B traffic violation.

a related item that I like because it calls for research:

(4) On or before January 1, 2017, the commission shall:

(a)Examine available research, and may conduct or commission new research, to investigate the influence of marijuana on the ability of a person to drive a vehicle and on the concentration of delta-9 tetrahydrocannabinol in a person's blood, in each case taking into account all relevant factors; and
(b) Present the results of the research to the Legislative Assembly and make recommendations to the Legislative Assembly regarding whether any amendments to the Oregon Vehicle Code are appropriate.

(13) "Marijuana extract" means a product obtained by separating resins from marijuana by solvent extraction, using solvents other than vegetable glycerin, such as butane, hexane, isopropyl alcohol, ethanol, and carbon dioxide.

so you can't make solvent extractions for home use but you *can* make vegetable glycerine extractions. Weirder. If the idea is to keep people from doing dangerous stuff with explosive solvents, this would be solved short of prohibiting "keep, or store homemade marijuana extracts", no?

In case you are wondering, vegetable glycerine extracts can be used in vape pen / e-cig type devices.

Alaska:

(b) Nothing in this chapter is intended to allow driving under the influence of marijuana or to supersede laws related to driving under the influence of marijuana.